Congenital myasthenic syndromes

Overview

These are different from myasthenia gravis because they're inherited, not immune.

Symptoms

Common signs:

• Weakness that worsens with use
• Double vision or droopy eyelids that get worse when tired

Less common

• Droopy eyelids
• Trouble feeding in babies

Look up a symptom: Muscle weakness in arms or legs

When to get medical care

Causes

Genes.

Does it spread or run in families?

• It isn't contagious. You can't catch it from someone else.

Diagnosis

A clinician asks about your symptoms and may order tests.

The exam

A physical exam.

Tests

Tests, if needed:

• Gene test:

Treatment

Treatment depends on the cause and how severe it is.

Self-care

• Pace activities
• Plan rest breaks
• Rest between activities

Prevention

To lower your risk or prevent problems:

• Genetic counseling

Which doctor treats this

• Start with your primary care provider (family doctor or internist).
• They may send you to a neurologist (brain and nerve doctor).

Living with it

Support groups and helplines

• Muscular Dystrophy Association (MDA): Care centers and support for neuromuscular diseases.
• Genetic and Rare Diseases Information Center (GARD): Free NIH information on rare diseases, including where to find experts and patient groups.
• National Organization for Rare Disorders (NORD): Patient groups, help finding care, and aid programs for rare diseases.

Children, pregnancy, and older adults

• Children: Often found in infancy.
• Babies: Often seen at birth.

Pregnancy and breastfeeding

• If you're pregnant or planning to be, tell your prenatal provider about this condition.
• Don't start or stop any medicine on your own. Some are safe in pregnancy and some need to be changed.
• Ask before taking any pain reliever. The FDA advises avoiding ibuprofen and naproxen after 20 weeks unless your doctor says to.
• Breastfeeding: Most medicines are fine, but ask. The NIH LactMed database lists what's known about each one.

Outlook

Medicines help many types.

Some types improve with medicine.

Getting ready for your visit

Bring a list of your symptoms and medicines.

What to bring

• A list of your medicines and supplements
• Notes on when symptoms started and what makes them better or worse

Questions to ask

• What's causing this?
• What treatment do you recommend?
• Which medicine fits my type?

Research studies

Research studies test new ways to find and treat health problems. Some are looking for volunteers. Talk with your doctor before joining one.

Search ClinicalTrials.gov for studies on Congenital myasthenic syndromes